Signal sound instrument



July- 31, 1923;

' 154631.361 P. GEORGI ET AL v I SIGNAL scum) INSTRUMENT Filed Dec. 20, 1920' lifq. a

iv 9 5 (A/VE/V ra/f l atented Jelly 31, 1923.

t3 sir 'srarss earns r series.

PAUL GEOEG-I AND ROBERT GEOEGI, OF LEIFZIG-GOHLTS, GERIKANY.

SIGNAL SOUND INSTRUMENT.

Application filed December 20, 1920. Serial No. 432,163.

Fig. l is a sectional side elevation of the same,

Fig. 2 is a rear View, with the rear cover omitted,

Fig. 3 is a sectional plan viewof a detail,

Fig. 4c is a fragmentary rear view of another detail, I

Fig. 5 is a sectional plan view of the latter.

The instrument. comprises a casing 0 composed of two easily detachable halves a and b, which are dusttightly held together by means of screws or the like (not illustrated). In said casing, a support (Z 18 pivotally arranged on a bolt 6 and adapted to be ad-.

justed by means of a regulating-screw f carrying nuts 9 which embrace the upper end of said support. The latter carries in ball-bearings h, 2' a step-shaft 7c,which is centrally located in said support and in said casing.

The shaft it carries a fixed concentric disc Z which is provided. with two segmental grooves m (Fig. 3), in which pro ecting.

clappers n are loosely and pivotally mounted at 0. The rotation of shaft 70 produced by an electromotor (indicated by armature r and collector C, Figs. 1 and 2) takes place in the direction of arrow (Fig.3). By rotation of shaft 7c, the clappers n are projected to outside said grooves by centrifugal force.

The casing half a. forms the detachable rear cover of the instrument, to allow an easy access to the interior of the same. The casing half 6 carries an outer flange a", over which engages the flange .9 of a sounding funnel t, a brass diaphragm being interposed between said fianges 1'. and 8 through V 'sion' when the shaft is rotates.

the medium of washers a, while screws '2), w

serveto hold said flanges r, 8 together.

I Said diaphragm carries on its rear sides I fixed pro ection 10, which is so located that it is struck by thelclappersin rapid succes- Consemesses quently, a'striking sound is producedby the vibration of the'diaphragm, which is first collected in the'rear compartment t of the sounding funnel t and then projected to outside the funnel; the diaphragm being provided. with a concentric annular projection w, whereby the sound is considerably increased.

By the adjustability of the upper end the support d, the distance between shaft k and diaphragm and thus between the pro 'jection of the latter and the clappers, can be regulated at will. v I r A further characteristic feature of [the present invention consists in the fact that the casing half 6 forms at its upper part a re sounding board y with a central opening 2 therein, the rear projection 12 of the diaphragm extending into said opening where it is struck by the olappers "a (Figs. 4 and 5).. By this means, the sound produced cannot be projected 'in rearward direction into the interior of the instrument but in forward direction through the funnel a only, whereby it is considerably increased.

Obviously, the funnelt may be cast-in one with thecasing half 6, the effect being a sharp accentuated'sound like an explosion and of highest. velocity. What we claim, is: In an electric sounding instrument for motor-cars and the 1ike,in combination, a casing consisting of two halves, a sounding funnel in front of said casing, a brass diaphragm'interposed between said casing and said sounding funnel, a rear projection on I said diaphragm, means co-acting with said. pro ection toloperate said diaphragm and located within said casing, one of said'casing halves forming a resounding bottom for said diaphragm and having a central opening therein through which extendssaidrear projection, substantially as set forth.

' PAUL GEGRGI.

- ROBERTGEORGT. 

